Rotary expansible chamber devices – Heat exchange or non-working fluid lubricating or sealing – With pump for non-working fluid
Patent
1998-01-14
2000-11-21
Denion, Thomas
Rotary expansible chamber devices
Heat exchange or non-working fluid lubricating or sealing
With pump for non-working fluid
418 15, 418 63, 418 97, 418102, 418248, F01C 2104
Patent
active
061494143
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns an oil-sealed vane-type rotary vacuum pump with an oil pump whose suction chamber is fitted with feeds for oil and gas. By loading the oil with gas, preferably with air, a reduction in the noise levels is attained when the vacuum pump is operating.
A vane-type rotary vacuum pump having the characteristics of the features of patent claim 1 is known from DE-A-3922417. The feed lines for gas and oil leading into the suction chamber of the oil pump according to the state-of-the-art are so arranged, that the oil pump will initially only pump air and then only oil. This is attained by designing the distance between the intake openings for air on the one hand and for oil on the other hand to be so great, that the intake opening for the oil is opened after the vane which follows next has already separated the circulating swept volume from the air intake opening. Simultaneous suction of air and oil is not possible. The known solution thus requires the use of an oil pump having at least three vanes which are arranged evenly spaced along its circumference. Only this ensures that oil will be sucked in also while the pump is running up. Without a supply of oil, both the oil pump and also the vane-type rotary vacuum pump which is to be supplied with oil would be damaged after a short time. A vane-type oil pump with three vanes is involved and thus costly. Moreover, the quantity of the air or quantity of the oil which is sucked in may only be influenced with the aid of nozzles with the risk that these might block.
From EU-A-474066 it is known to mix--in an oil pump which is also of the vane type--the supplied gas and oil before it enters into the oil pump. A Venturi nozzle is used for this. In the area of the Venturi nozzle the air flow and the oil flow run in parallel. Thus a pressure drop is created so that the oil is entrained with the gases. This solution too, is engineering wise relatively involved in particular because the use of a Venturi nozzle.
SUMMARY OF THE INVENTION
It is the task of the present invention to design an oil-sealed vacuum pump of the aforementioned kind in such a manner that its supply with a mixture of gas and oil is especially simple.
This task is solved through the present invention by the characteristic features of patent claim 1. In a vacuum pump designed according to the present invention, it is no longer required to employ oil pumps of the vane type and/or means which are independent of the oil pump to mix oil and air. Because initially oil and then a mixture of air and oil is sucked in simultaneously, gas and air are already mixed efficiently in the oil pump. Suction of oil at first and then oil as well as air is performed and it is released into the same swept volume. Oil pumps equipped with vanes in which the swept volumes need to separate the intake openings for air and gas at all times are no longer required. Furthermore, a special advantage is, that that quantity of the sucked in share of the air can be controlled by the angle of the intake opening for the air. The use of nozzles for the purpose of influencing the air/oil shares in the pumped mixture can be dispensed with.
BRIEF DESCRIPTION OF THE INVENTION
Further advantages and details of the present invention shall be explained on the basis of the design example presented in drawing FIGS. 1 and 2.
Drawing FIG. 1 a longitudinal section through a design example for a vane-type rotary vacuum pump according to the present invention and
Drawing FIG. 2 a top view on to a bearing section in which the oil pump is accommodated.
The presented pump 1 comprises the subassemblies casing 2, rotor 3 and drive motor 4.
DESCRIPTION OF THE INVENTION
The casing 2 has substantially the shape of a pot with an outer wall 5, with the lid 6, with an inner section 7 and the suction chambers 8, 9 as well as rotor-mounting bore 11, with end section 12 and bearing section 13 which complete suction chambers 8, 9 at their face sides. The axis of the rotor-mounting bore 11 is designated as 14. Locate
REFERENCES:
patent: 2233017 (1941-02-01), Lambin
patent: 3166017 (1965-01-01), Mamo
patent: 3707339 (1972-12-01), Budgen
patent: 4276005 (1981-06-01), Bassan
patent: 4575322 (1986-03-01), Paquet et al.
patent: 4967707 (1990-11-01), Rogant
patent: 5181414 (1993-01-01), Baret et al.
Abelen Thomas
Muller Peter
Denion Thomas
Leybold Vakuum GmbH
Trieu Thai-Ba
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